Grinding-machine.



E. RIVETT.-

GRINDING MACHINE. 1

APPLICATION FILED MAR. 29. 1916. RENEWED MAR. 19,1917.

1,288,998, Pafiented Dec. 24, 1918.

Inventor. Edward RiveU. by WWkW Anya E. RIVE TT.

GRINDING MACHINE. I APPLICATION- FILED MAR. 29. 1916. RENEWED MAR. |s.1911.

' Patented Dec. 24, 1918.

4 SHEETS-SHEET 2- Fig.2;

Inventor. 1 Edward Rivelt bYWWkW Al'ly's.

E."-'RIVETT.

GRINDING MACHlNE. APPLICATION rush MAR. 29. 1916. RENEWED MAR. 19.191

1,288,998 Patented Dec. 24, 1918.

4 SHEETS-SHEET 3.

\nvenTor. Edward Riven, yfmdwxw E. RIVETT. GRINDING MACHINE. APPLICATION FILED MAR. 29, M6. RENEWH) MAR. 19.191]- v Patented Dec. 24,1918.

\nve'n'tor. Edward Riven, YJEeMdMIrW EDWARD RIVETT, or HnLL, MASSACHUSETTS.

GRINDING-MACHINE.

- Specification of Letters Patent.

Patented Dec. 24, 191 8.

Application filed March 29. i916, Serial No. 87.607. V Renewed March 19. 1917. Serial No. 155,946.

citizen of the United States, residing at Hull, county of Plymouth, State f Massachusetts, have invented an Improvement 'in Grinding-Machines, of which the following description, in connection with the accompanying drawing, is a specification, like characters on the drawing representing like parts.

This invention relates to a machine for grinding, polishing or similar purposes.

One object of the invention is to provide a machine in which the grinding tool is mounted upon a vertical spindle and the work is fed vertically thereto thus enabling the machine to be so constructed that the work may be handled and the operations carried on with ease and efficiency.

Another object of the invention is to provide a self-contained machine of this type with all the driven parts operated from a single main. shaft so that the machine when set up may-have its main shaft directly connected with a line of shafting. motor or other source of power.

Another objec oi" the invention is to provide a machine of this type in which a plurality of grinding tools are located and operated so that a single operator may attend to all of them. A further object is' to arrange each of these units so that each may be thrown into or out of operation imlependent-ly of the others. and so that the relative feeding movements of the work and grinder may be sqmratelv varied and adjusted in each unit.

Ai'iother object of the ill tion resides in PlfOYltllllg cllicient means for controlling and carrying away the water and oil waste in the grinding operations, and in lubrication, and in preventing the splashing of the same from the machine. Another feature of the invention resides in the construction, mounting and adjustncnt of the swinguig head fcr ea h grinding tool which pivoted on a vertical axis and by means of which the relative transverse movement between the tool and the work is'se ured. Another feature of the invention resides in the means for feeding the v.(rk either ani nmlirall or manually as desired" Another-feature of the inventioi resides in the means for driving the grinding tools. lach grinding tool is driven by an endless belt from a pulley with the belt so arranged- !hat ltlClltll thrust n the grinding spindie is balan ed. thus preventing any deflection or binding, while at the same time the belt substantially encircles the grinding spindle thus insuring a large and effective driving pull and enabling the spindle to be run at a very high sl'ced with a comparatively small and light belt. The same idea iS applied to the drive at the several units of the machine from the main shaft. in both cases the endless belt passes from the driving pulley about comparatively small oppositely located idler pulleys to the puller to be driven tliuc insuring the substantial encircling of the driven pulley by the bel Theseand other objects and features of the invention will be more fully set forth in the laccompanying description and drawings and defined. by the claims.

The drawings illustrate a preferred form of machine embodying the invention with such features thereof as are necessary to an understanding of the invention shownQlmt with the minor details of construction which will to desirable and which are familiar to those skilled in the art being omitted as unnecessary refinements. The machine is shown as provided with three grinding units, but it is obvious that any number desired may be provided and the repetition or duplication of the parts will be sulliciently understood from a description of a machine embodying the three units illus= t ated. I

In the drawings, Figure l is a view chiefly in vertical cross section taken through one of the grinding units with some of the parts shown in side elevation;

Fig. 2 is a front view of one end ofthe machine showing one of the units and with a portion of the frame or bed of the machine in vertical cross section;

Fig. 3 is a top plan view of the portion of the machine shown in Fig. 2 with some of the parts broken away. and a portion ofthe machine in horizontal cross section;

Fig. 4 is a top plan view on a smaller scale with some of the parts removed of the entire machine chiefly for the purpose of showing'thedriving connections;

Fig. 5 is a rear elevation of the belt drive for the grinling units.

The machine. as illustrated is shown as provided with three grinding units although as set forth any number of these units may be provided as" desired. The tool illustrated in each case a grmdnigwheel forgr n ding the interior of cylindrical"articles but it is obvious that these tools may be varied and the character of, the work performed upon the machine may-he varied Within the limits of the ii'vention, audit is also obvious that the machine while described as a grinder. maybe used for polishingor forany other similar purpose.

The'various parts'ot" the machine mea s:

ported in, on or from a framework, bed or table which asillustmted and for convenience comprises two sections. The lower section 1 may be of a more or le ss 'skelet'on box-like structure standingupon the floor while the upper sect1on2 1s =connectedto per section presents the generally horizontal bed 3 and surrounding theifront min-4, back wall 5, and side walls 6 -Thisibed and side, walls thus fornra long rectangular. chamber open at the top and which receires l-the oil andwater used in the grinding operat-ion andin lubrication; and from. which thisoil' and water ina-y be drained cried way to the sources of Oll and Water supply.

A' main Shaftd is suitably journaled in brackets 8 projecting rearwardly from the lower porti'onil' 'of the machine frame'and extends horizontally. at the rear of the nia- ,chine franie'. Fast and loosepulleysfl and v 10 mounted 'at'one end: "of this shaft are illustrated assuitable means bygwhich the main shaft may r-beeonnected to and driven from the line of shafting, motor, or other source of power. Froin this main shaftall the working parts of the machine. including itssev'eral units are operated so that the machine? presents a self-contained structure.

which when assembled and setupni'ay be connected directly to the source'of power in an easy and, expeditious manner. I

The machine comprises a pl-uralityof opis similar in its construction and operation it will be necessary in describingthe. 111:1-

f chine for the/most partto illustrate and} denections and [its operation.

scribe but one ot'these units and its con- Each unit cbn'iprises a "crtically arranged rotatable and Vertically movable chuck spindle ll n'iounted in 'ertical, bearings 12 and 13, which bearihvs for convenience form in teg'ral parts of a1 chuck spindle casing l-l.

Tllhisicasing 14 'isftitted into a socketv 1:3 in

thexbed' 3 and secured ifirmlygin place with" a tight joint, TheIupperend of this casing lei- {where the bearing 13' is formed and whichprojects upwardly above the bed t is formed of gei-iera'l ly"frusto-conical shape as illustrated. I

This projecting bearing 13 is surroluidcd at its'pcriphery with a Vertical guard wall 16 which receives the oil and water and erati'vegrinding units and as each of these.

from which it drains through holes 17 to ,"the cliarnbenpresented he befd .o'fthc niachine Arniovableg 'dfit'allextension i 18'sh0Wn. in dotted lines extends upwardly v ,fronrthe' guard ,w ll 16 to the required height. and abovethe line of operation of fthe'tool; A petticoat' uard 19 is supported on the upper end of the chuck spindle and extends: downwardly in the guard fwalllb. A 'chuckQQ of suitable form is secured to the "chuck spindle "on top" of the Petticoat guard 19. By thisconstructiou the water employed in grindingis directed downfinto the guard 16 and is prevented by the petticoat guard ,19Tfrom reaching the bearings of the chuck spindlepand any' oil throunoff v Iby centrifugal force isalso guidedby the and rests upon the lower section. This uppetticoat guard into the vertical-guard 16. The oil and Water are drained or pumped "away fflOlillhB chamber at the bed of the inachine, and if desired back to their sources of supplyybut as the means for draining and tool-and a rotary movement to assist in the griil'cling operation. For .this purpose each chuck spindle is'provided with af cylindrical pulley 2'11 I i i'sfsecured byffa belt'drivecomprising abelt 22 extending fron the pulley around a l horizontally journaledv con'e'pulley This cone pulley: is 'journa' l at 'Ql-jiu bracket arms 25"111 turn journaled at their lower ends at 26 eccentrically'of the main shaft r 7. The hainfshaft a'rriesh corresponding cone pulley27 belted at 28 to the conepulley 23. Hencebyshifting the belt 28-the speed'ot" rotation of tl1e'cl1uck,spindle niay i be varied. 11A connecting rod' ;'2i.extends from'the bracket 25- through tothe front of the machine and by means of" it the brac'ketQfi maybe rocked about its pivot ,26 toloosen the belt 22 andjth us stop the rotation of the chi'i'ck 'spindle, 01'- 'it may be moved so as to swing the bracket 25 rearwardly to an extentrer tiled-t0 take up any "slack or tighten both ,lihe belt and the belt 28, this latter function being secured by re an of the pivot 26, being eccentric of the shaft 7f I v TheW' ertical or'iivork feeding nioiieinent of the chuck spindles may take place either imwenient of all or any number of the chuck in varying eXtents as required.

I flhen'lechanisin' for securing theivertica-l or work feeding movement as well as oerspindles may take.- place 'siinultaneouslyand' movement to feed thework to' thef grinding The rotary movement of the chuck spindle automaticalljr' or *i'nanu'ally and theteeding' wastes slide bar 30. This heart-shaped cam 38 is carried and driven by a shaft extending transversely of the lower section 1 of the maohlne framea The shaft" carries a beveled gear 36 meshing with a beveled gearv 37 on a shaft 38 extending at right angles to the shaft 35 and driven by a gear 39 meshing with a pinion 40 on the main shaft 7, I

The slide rod 31 receives it reciprocatory moven'ient from the slide bar 30 bymeans of a leverdl fulcrumed at 4'2- on the lower portion 1 'of the machine frame work and pivoted at its lower end. ata3 to t he' slide bar 30 and, at its upper end 44 to the slide rod 31, I

Opposite each grinding unit the slide bar 30 is provided with a spiral cam 45 pivoted therein. A tongue 4E6 is pivoted at- 47 in the s ide "bar 80 and has its free end resting upon the spiral cam 45. A vertical rod 4 is mounted to. slidevertically in bearings 4: at the front of each chuck spindle casing 14- and is orovided with a step 50 beneath the chuck pindle. This rod 48 is provided with a roll 51 extending above and adapted to he traversed by the tongue 46'in the reciprocatory movement. of the slide bar 30.

in order-to secure accuracy of movement of the chuck spindle and provide for any misalinement of the parts a connection such as that illustrated between the chuck spindle and the step 50 may be employed. This con uection is shown asa pin 52 having a ball 53 at its lower end seated in a corresponding socket 5+ on the step 50. The upper end of the pin 32 enters a chamber 55 in the lower end at the chuckspindle l1 and is provided with a collar 56 by which it is kept from falling out. At its upper end the pin is "onical in shape and rests in a conical deprcssion in the spindle.

ciln'iu'aln. y. feeding movement that the ends mg movements in one direction hya spring of the hole are apt to flare very slightly. To eliminate this inaccuracy the upper or guiding surface of the tongue 46 may be shaped as illustrated so as to present a sharper in clination at each. end of the traverse, thus securing a more rapid feeding movement at each end of the traverse and consequently less grinding action at each end.

If the spiral cam 43') of any unit be soturned about its pivot as to allow the tongue l6 to'pass below the top of the slide bar 30. the roll 5'1 will rest upon the top of the slide bar. and consequently no work feeding movement of the chuck spindle will take place. (.onsequently by thus moving the spiral cam the workfeed may be thrown out of action.

The vertical work feeding movement of the chuck spindle may also be given manually by graduallyrotating the spiral cam 45 through manually ope 'ated connections to raise and lower the tongue 46 and with it the roll 51. This manually ope ated means is in the construction illustrated preferably combined with the means for setting the spiral cam -15 to provide for the required range of vertical movement when the machine is feeding automatically. The construction thus illustrated comprises a horizontal shaft 57 journaled in the upper section 2 of the frai'ne-work of the machine and provided at its forward end with a crank 58. A set Screw 59 in the crank abutting against a dial plate 60 enables the crank to be locked.

' at any angular position. This dial plate (30 may be graduated and provided with indicia to indicatethe position of the crank or the position to which it should be set to provide a. given adjustment. At the rear end the shaft. 57 is provided with a gear (31 meshing with a gear 62 journaled in a depending bracket 63. This gear 62 operates the spiral cam 45 through an extensible universal joint connection. This connection as illustrated comprises a stub shaft (n on which the gear 62 is mounted, a stub shaft 65 pivoted at 6 to the stub shaft. 64, a link parallelogrmn (i7 bivoted at one corner to the. stub shaft (35 and at the other corner to a. shaft section 68. the stub shaft 69 on which the spiral cam 45 is mounted, and a universal joint 70 between the shaft section 68 and the stub shaft 69. Thus the rotary motion of the shaft 5'7 is communicated to the spiral cam 45 independent of any movement of the slide bar 30 in which the spiral cam l5 and itsstuh shaft 69 is mounted.

It will thus be seen that to give a vertical feeding movement to the chuck spindle manually it is only necessary to turn the crank 58, and through the connections described the spiral cam will be rotated, the

tentof vertical movement it is only necessary to turn the crank 58 and lock it in position with the set screw 59 at a .point where the required exten't of movement will result. It will also be seen that as each crank '58 and its connections to each spiral cam 45 is independent in a similar mechanism with respect to each unit of the grinder that this manual feed and this manual adjustment may be made independently in each case, according to the'character of work being operated upon or the particular conditions existing.- In the caSeof each'unit the mechanism for 0 era'ting, controlling and adjusting the grin ing tool itself is the same and each is independent of the other.

' In the case of this mechanism it is necessary to have a transverse adjustment and feeding movement of the grinding tool in order to bring it up to the work and to feed it as the grinding operation proceeds;

Morespecific ally considered and as illus-' trated in the drawings, there is provided rising from the rear wall 5 of the upper section of the frame-Work of the machine the large vertical bearing stud 71 in the rear of andin alinement with each chuck spindle.

A swinging head 72' is provided at its rear end with a sleeve journaled on the hearing stud 71. This swinging head at its for ward end is provided with bearings 74 in drivingmechanism which will be described later.

An arm 77 rigid with the swinging head projects laterally therefrom and is provided at its end With a screw 78 having a milled cap 79 which in conjunction with the arm may be provided with micrometcr graduations in a familiar manner. The screw 78 abutsagainst a plate 80 pivoted at 81 to the arm 77. This plate 80 at its free end abuts against. an eccentric 82 carried on a vertical shaft 83 journaled in the rear Wall 5 ofthe frame-Workof the machine. A heavy spring 84 connects the arm 77 and the rear wall 5 and acts to hold the arm 77 so as .to bring and maintain the plate 80 in contact with the eccentric 82and the screw 78 in contact withthe plate 80. At its lower end the shaft 83 is provided with an arm 85 carrying-at its free end and journaled therein a verticalgstud 86 screw-threaded horizontally In this invention this result is secured by mountto receive the screw-threaded end of a small medium of this mechanism when the gear isrotated the screw-tlireaded end of the shaft 87 will swing the arm 85 to the rightor to the left carrying with it the'shaft 83 and the eccentric S2, and thus in turn swinging the arm T7,-and thus the swinging head with the grinding tool; It wi l alsobe' seen that by the medium of the micrometer screw cap 79 the swinging head can be ad usted to any desired position with respect to the eccentric 82. If now the gear 90 be rotated automaticall the swinging head will be swung in yd: direction or the other gradually and utomatically. Thus the grinding tool maybe fed automatically up to the work. By setting the parts so that when the desired limit offecding movemcntis reached the high point of the eccentric 83 will be in contact with the plate 80, it follows that if the feed continued it would be reversed in direction and thus any danger of grinding the work more than desired is automatically prevented.

As a suitable means for giving automatic movement to the gear'90 and thus automatic feeding movement to the swinging head the slide bar 31 is shown as provided with a pair.

of pawls 91 and 92. Each of these pawls is pivoted to a sleeve 93 held in place by a set screw 9% at the required point to the slide rod'3l. Accordingly, as one or the other of these pawls is swung dowmvardly to rest upon its stop pin 95 it will engage the gear 90 and move it in one direction or the other according to the pawl in use with each reciprocation of the slide bar.. The direction of rotation of the gear will be determined by the pawl which is used and the extent to which the gear 90 is rotated will depend upon the position at which the sleeve 94 carrying the pawl is set on the slide rod 31. Consequently, the gear 90 may be rotated to any desired extent and in either direction automatically, and consequently the grinder tool fed transversely with any desired de gree of rapidity and in either direction antomatically.

Each grinding tool is'rotated by a. belt connection with a driver spindle arranged in the rear of the machine opposite the swinging head and as here again the constructionis the same with respect to each swinging head it is necessary to describe but one. The driver spindle 96 is provided at its lower end with a ball 97 mounted in a socket in a bracket 98 projecting from the upper section 2 of the machine frame. At

its upper end it is journaled in an arm 99 set at different degrees of vertical adjustment to adjustcorrespondingly the vertical position of the grinding tool.

The driver spindle 96 is provided'at its lower end with a pair of small pulleys or a double grooved pulley 104 and 105. A tubular casing 100 surrounds the driver spindle 00 between the pulley 100 and the pulley 101. has a ball and socket connection with the arm 0!) and an enlargement 107 at its lower end abutting the pulley 101, and thus providing l'or lubrication. v I

The grinder spindle is provided at its up-' per end with a pair of pulleys or a double grooved pulley 108 and 101). The swinging head is provided at each side of the grinder spindle with short verti al studs upon each of whi h ismounted a pair of idler pulleys 110. 111. 112 and 113. A belt extends from the pulley .100 around the idler 112, around the pulley 108, back around the idler 113, across 1;,o and around the idler 110, back around the pulley 10S). and then around thridler 111, back around the pulley 100. By arranging the belt drive in this manner, there is no tendency to cause the drive to throw the grinder spindle out of alinement be ause the. force exerted by the belt is balanced. Furlherinore,'by this arrangement a. single endless belt is einploved for each grinder unit, and any slack in this belt readily taken up at one time by adjusting the arm 09.

The several driver spindles are also in the preferred form. of this invention sinni'ltaneously driven by a single endless belt from the, main shaft of the machine, and the arrangement .is such as to secure a similar balancing of the forces exerted by the belt on each driver spindle so that in the case of each indl there is no tendency of the belt to throw the spindl out of alinement. drive as arranged for driving three units is illustrated in the preferred form in Figs. 1.

and '5 of the drawings. Thepair of small nulleys or the double grooved pulley on the d iver spindle at the right'of the/machine is shown at 104 and 105, at the middle at 10 1 and 105", and at'the left. at 104 and 105;

These are driven pulleys and act to drive the driver spindles. The endless bclt is'driven' from a main pulley 114 secured to the main shaft 7, and this shaft is horizontally ar- This disclosed herein is also disclosed and made ranged a pair of horizontally deflecting pulleys 115, 116 are employed to deflect the belt from a vertical to a horizontal run. Idler pulleys are also vertically mounted and located at each end of the row ofthe driver spindle driver pulleys. The idler pulley 117 adjacent the main pulley 111 requires but one groove while the idler pulley at the opposite end has the double groove 118, 119.

Provision is made for controlling the slack in the endless belt by making this idler pulley 118and 119 adjustable longitudinally of the machine as indicated at 12 The driving belt 191 leads from the main pulley 114 over the deflecting pulley 115 around the pulley 104?, back around the idler pulley 117, then around the pulley 104", then back around the pulley 105*, then around the idler 118, then back around the pulley 105, then around the idler 119, then back around the pulley 105", then around pulley 101, and then back over the deflecting pulley 116 to the main pulley 114.

The arrangement of the pulleys and the driving belt has thus been described with respect to a machine'provided with three units, but its application to a machine providedwith a greater number or with but two will be apparentdtoa skilledmechanio. It will be observed that this disposition of the belt causes the strain of the drive to be balanced upon each driver spindle, thus preventing any interference with the alinement ot' the spindles, and eliminating any tendency to binding due to the drive,

It will thus be seen that the drive for each grinder spindle has similar characteristics to, the drive from the main shaft to the several units of the machine. arrangement is such that. the double engagement of the belt with the driven nulleyinsures a substantial encircling of the driven In each case the pulley by the belt, and thus a very effective driving pull. The idler pulleys employed to guide the endless belt twice about the driven pulley are relatively small so that the belt substantially encircles the driven pulley. By

reason of the pull which is thus obtained a i I ture of the invention enables this high speed tobe efl'ectively attained. Y

The invention in the power transmission the subject of claims in an application di vided out of this application 142.087, filed January 12, 1917.

Having fully described my invention,

. what I claim as new and desire to secure by Letters Patent is Serial No.

1. A grinding machine comprising a ro- .tatable vertical grinder spindle with a grinder mounted thereon, a rotatable vertical] y movable vertical chyick v spindle, a.

Itieally movablevertical'fcliuck spindle, a

grinder spindle. Y

3 able vertical chuck spindle, a chuck mounted 40 chuck. mounted 1031; the l upperfiend ofirthe chuck spindle,"meansfl for rotating the chuck x spindle, and means lfOI'i giving a relative chuck mounted on the upper 'end of them chuck spindle,' means foi rotati'ng the chuck spindle, means'tor giving a relat ve vertical t feeding movement between'the chuck spindle tween the chuckspindleand grinder spindle. 3. A grinding machine comprising a ro-.- tatable vertical grinder spindle with a grinder mounted thereoma rotatable verchuck mounted on the upper endof the chuck spindle, means for rotating; the chuck spindle, means for a giving a relative wh n feeding movement between the chuck spindle andgrinder spindle, and meaiis'for-adjusting the vertical relation ofthe chuck spindleand 3 4. A grinding machine comprising a rota' table vert cal grinderspindlewithra grinder mounted thereon, a, rotatablevertically mov-y ablevei tical chuck 'spindle,achuckniounted' on the upper end of tlie chuck"spindle,meai s for rotating the chuck spindle, and means for giving a variable reciprocating vertical feeding movement to the chuck spindle.

grinding machine comprising a rotatable vertical grinder spindle with a grinder mounted thereon, a rotatable vertically movon the upper end of thevchuckspindle, means for rotating the chucks'pindle, and means for giving a variable reciprocating vertical feedingniovement to the chuck spindle, the said movement being faster at each end of the reciprocati'on." 7 g i. 6. A grinding machine comprising a rota table vertical grinder spindle with a grinder mountedthe'reon', a/rotatable vertically inovablevertical chuck spindle, a chuck mounted on the upper end of the chuck spindle, means for rotating the chuck spindle, and llltltllS forgiving a vertical feeding inovemeiitto the chiick'spindle. I i i 7. grinding machine comprisinga rota? tableverti'ca'l grinder spindle with a grinder mounted thereon, 'a rota tablewerticallvi in0vable vertical-chuck spindle, a chuck mounted on the upper end ofthe chuck spindle, meansfor rotatingthe chuck spindle, and means for giving eitherautomatically oi inai'iually as required a. vertical feeding movement to the chuck spindle; i a

8. A grinding: machine comprising a ,hori? zo ntally swinging hea d c'a'rrying rotatable vertical grinding ingmoveinent. and grinder spindle, means fpr giving a relativetransverse. feeding movement .be-

mounted thereon, a chuck located beneath the *grinder Spindle, and means 'tor auto matically giving a swinging transverse feeding movement to said head. g 9; A grinding machine comprising a horizontall; swinging head carrying a rotaialile vertic'al grind ng spindle .with a grinder .mduntedthereon, a, chuck located beneath the grinder spindle, means tor autdmat call giving a swinging transverse ieeding movementto said head, and means for adjusting 10. A- grinding machine .coii'ip ising' a horizontallysw nging'head carrying a rotathelimiting position of saidtransverse fee-(t table vertical grinding spindle with a grinder ii'iounted thereon, a chuck located beneath the grinder spindle, and means for automatically giving a. s\'vin'ging trai'isverse feeding movement to said head, the said feeding means acting to reverse the direction of feed whenthe -limiting position is reached.

llQA grinding machine comprising a horizontally swinging head carrying a rotatable vertical grinding spindle with a grinder mountedthereon, a chuck located beneath thegriudcr spindle, means ton auto- .inatically giving a swinging transversefeedg ngmovement to said head, and means for verticallyadjusting the swinging head. i

movable chuckispindles passing up t hrough .said table and provided with chucks, a bean 12. grindii'ig nachine comprising a 'table having tront, rear and side walls to, preing for each chuckspindle projecting above ,the table, and a vertical guard wall sur- I round ng each of said pro ectingbearings.

13. A grinding machine comprising a taniovable chuck spindles passing up through said table and provided with chucks, a bearing for each chuck spindle projecting above the table, a .vertical giuird wall surroundin each of said projectingbearings, and a pettie coat guard onthe upper end .of each chuck spindle depending within said'v ei'tical guard wall.

ing for each chuck spindle projectingabove the table, a vertical guard wall surroui' ding each ofsaid projectii'ig bearings, and a re s the 'work held in the chuck. I I

, 15; A grinding machine comprising a plu- 'a1ity of rotatable vertical and verticallv pindlewith a grinder inova'bleclnick spindles provided with a 1 movable guard WilllQXi'CliHimi surrounding 105 ble having frontrom and side walls to p 'esent an oil and water receiving chamber, ,a plural ty o'l vertical, rotatable andzvertically chucks, a corresponding plurality of horizontally swinging heads carrying rotatable vertical grinder spindles with grinders mounted thereon, means for giving relative vertical feeding.movements between each chuck spindle and its coiiperating grinder spindle, a main shaft, driving connections from said main shaft to each grinder spindle, to each chuck spindle, and to the said feeding means, whereby the entire machine is operated by connecting the main shaft to a suitable source of power.

16. A grinding machine comprising a plurality of rotatable vertical and vertically movable chuck spindles provided with chucks, a corresponding plurality of horizontally swinging heads carrying rotatable. vertical grinder spindles with grinders mounted thereon, means for givingrelative vertical feeding movements between each chuck spindle and its cooperating grinder spindle, means for giving a transverse feeding movement to each swinging head, a main shaft, driving connections from said main shaft to each grinder spindle, to each chuck spindle, and to each of the said feeding means, whereby the entire machine is operated'by connecting the main shaft. to a suitable source of power.

17 A grinding machine comprising" a horizontally swinging head carrying a rotatable vertical grinding spindle with a grinder mounted thereon, an arm extending laterally from said head, an eccentric mounted for horizontal rotation in the machine frame and in engagement with said arm, and means for automatically rotating said eccentric to give av transverse feeding movement to the grinder.

18. A grinding machine comprising a horizontally swinging head carrying a rotatable vertical grinding spindle with a grinder mounted thereon, an arm extending laterally from said head, an eccentric mounted for horizontal rotation in the machine frame and in engagement with said arm, and means for automatically rotating said eccentric in either direction to give transverse feeding movements to said grinder.

19. A grinding machine comprising a horizontally swinging head carrying a rotatable vertical grinding spindle with a grinder mounted thereon, an arm extending laterally from said head, an eccentric mounted for horizontal rotation in the machine frame. and in engagement with said arm, and paw] and ratchet mechanism including reversely acting pawls either of Which may be thrown into operation as desired for causing the rotation of said eccentric to give required transverse feeding movement to the grinder.

20. A grinding machine comprising a framework presenting a table, a vertical bearing stud mounted at the rear of the said.

table, a horizontally swinging head mounted on said bearing stud and carrying a rotatable vertical grinder spindle with a grinder mounted thereon, a chuck located in the table beneath the head, and means for automatically giving aswingingtransverse feeding movement to said head. I

21. A grinding machine comprising a framework presenting a table, a vertical bearing stud mounted at the rear of the said table, a horizontally swinging head mounted nnsaid bearing stud and carrying a rotatable vertical grinder spindle with a grinder mounted thereon, a chuck located in the table beneath. the head, and means for. vertically adjusting the swinging head on its stud. v

22. A. grinding machine comprising a plurality of rotatable vertical and vertically movable chuck spindles provided with chucks, a corresponding plurality of cooperating vertical grinder spindles with grinders mounted thereon, means for givin vertical feeding movements to the chuc. spindles, and means for independently varying the extent of the vertical feeding movement of each chuck spindle.

23. A grinding machine comprising a plurality of rotatable, vertical, and vertically movable chuck spindles provided with chucks, a corresponding plurality of coopcrating vertical grinder spindles with grinders mounted thereon,- and means for giving either manually or automatically vertical feedinginovement to the said spindles.

24. A grinding machine comprising a. plurality of rotatable, vertical, and vertically movable chuck spindlesprovided with chucks, a corresponding plurality of cooperating vertical grinder spindles with'grinders mounted thereon, means for automatically giving vertical feeding movements to the said spindles, and means for stopping the feeding movement of any spindle without interfering with that of the others.

25. A grinding machine comprising a plurality of rotatable, vertical, and vertically movable chuck spindles provided with chucks, a corresponding plurality of cooperating vertical grinder spindles with grindersmounted thereon, means-for automatically giving vertical feeding movements to the said spindles, and means for varying the extent of the feeding movement of any spindle without effecting the feeding move ments of the others. v

26. A grinding machine comprising a plurality of horizontally swinging heads carrying rotatable, vertical grinder spindles wit-h grinders mounted thereon, a corresponding plurality of vertical rotatable chuck spindles mounted therebeneath, means for automatically giving swinging transverse feeding movements to each of said heads, and means for independently adjusttion of the said transverse movement of anyv head independently of the others.

28. grinding machine comprising a plurality of horizontally swinging heads carrying rotatable vertical grinder spindles with grinders mounted thereon, a corresponding plurality of vertical rotatable chuck spin dles mounted thereben'eath, means for automatically giving swinging transverse feeding movements to each of said heads, and i means for independentlyadjusting the ex tent of the transverse movement of any head without effecting that of the others.

29. A grinding. machine comprising a grinder niiember, a chuck member, and means for giving a relative vertical feeding movementto said members, comprising a horizontallyreciprooating slide bar, a tongue pivoted in the slide bar and engaging one of said members. and means for adjusting the angular position of said tongue.

30. A grinding machine comprising a grinding member. a ch lick member, and means for giving a relative vertical feeding movement to said members, comprising a horizontally reciprocating slide bar, a tongue pivoted in the slide bar, and engaging one of "on the slide bar for adjusting the said members, and means mounted on the slide bar for adjusting the angular position mg movement to said members, comprising a horizontally reciprocating sl de bar, a

tongue pivoted in the slide bar and engaging one of said members, and means for adjustingthe angular position of said tongue.

83. A grinding machine comprising a rotatable vertically movable vertical 'ohuck spindle, a horizontally reciprocating slide bar, a tongue pivoted in'the slide bar and engaging said s indle, and means mounted angular position of the tongue. j

34. A grinding machine comprising a rotatable vertically movable vertical chuck spindle, a horizontally reciprocating. slide bar, a tongue pivoted in the slide banand engaging said spindle, and aspiral cam.-

mounted on the slide bar engaging the tongue and determining the dgreeof angu larity of the said tongue.

' In testimony whereof, I have signed my name to this specification.

' EDWARD RIVETT. 

